Inheritance

Sex Linkage is the phenotypic expression of an allele that is related to the chromosomal sex of an individual

Since there are far more genes on the X chromosome than the Y, there are far more X linked traits than Y linked traits.

Males get the short end of the stick. Males, or heterogametics have a higher incidence of expression of certain characteristics, because of the fact that there is no other allele to mask the damaged one. If this is the case, all males that get the gene or allele that codes for the damaged expression will express to the fullest extent.